Abstract
The article considers the petrogeochemical features of the Late Cenozoic collisional volcanism of the Lesser Caucasus. Based on new geochemical data, it is shown that Nb, Ta, Hf, and Zr minima are observed for basic and intermediate rocks. The salic rocks are strongly enriched in Rb, Ba, Th, La and depleted in Ti, Yb, Y relative to the primitive mantle. The enrichment in incompatible elements suggests that the source of the melt from which the magma was derived was a metasomatized lithospheric mantle enriched in potassium and incompatible elements. Late Miocene-Quaternary volcanics were formed at different degrees of melting of subduction-enriched subcontinental lithospheric mantle. The role of the suprasubduction material decreases during the evolution of volcanism over time due to an increase in the share of the asthenospheric component in the interval from the Upper Miocene to the Quaternary.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
